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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd608d7e456587304444e2768edf0e0cbe831fd58e7e154d673cbefd0f0f63ea' 
  AND token = 'C/ym2MJvSkW+krvZKNeFnG+D7H1oNPglrkXZ1Fy/9iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}